Abstract
WITH a spark between a lead electrode and an electrode of palladium or one made of a platinum rhodium alloy, it was found that doubly-charged lead ions were formed, which in the mass-spectrograph gave close doublets with the singly-charged rhodium and palladium ions at 102, 103 and 104. The mass differences were 0·0860 ± 0·003 at 104 (Pd), and 0·0861 ± 0·003 at 103 (Rh). Although the packing fractions of palladium and rhodium have not been determined directly, they occupy a position on Dr. Aston's curve1 where the divergence of the atomic mass from an even integer reaches its maximum value of approximately 0·085 ± 0·005. Assuming this value as applying to palladium and rhodium, we find a value for the atomic masses of the lead isotopes of 206·00 ± 0·01 and 208·00 ± 0·01.
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References
NATURE, [137, 120 (1936)].
F. W. Aston, NATURE, 137, 358 (1936).
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DEMPSTER, A. Mass Equivalent of the Energy in Radioactive Transformations. Nature 138, 201 (1936). https://doi.org/10.1038/138201a0
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DOI: https://doi.org/10.1038/138201a0
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